SharePoint Online: How to Disable Subsite Creation?

Requirement: Disable subsite creation in SharePoint Online.

How to disable subsites in SharePoint Online?
Microsoft recommends using hub sites to connect related sites instead of creating subsites for performance, management reasons. So, its a good idea to restrict the subsite creation option at tenant level. You can turn off subsite creation from the SharePoint Online Admin Center.
  • Login to SharePoint Online Admin Center >> Click on Settings
    disable subsites sharepoint online
  • In settings page, under "Subsite creation" section, we've:    
    • Hide the Subsite command - Turning off SharePoint subsite creation on all sites
    • Show the Subsite command only for classic sites - Turning on SharePoint subsite creation only on Classic sites
    • Show the Subsite command for all sites - Turning on SharePoint subsite creation on all sites
      sharepoint online disable subsite creation
Select "Hide the subsite command" and then click on the "Save" button at the bottom of the page to commit your changes. This disables the "subsite" option from the site contents page.
sharepoint online turn off subsite creation
These changes could take some time to reflect. You can still group site collections using Hub Sites in SharePoint Online that allow you to connect multiple sites in one manageable structure without using subsites.
In SharePoint On-premises environments, we can restrict subsite creation through: Manage Web Applications >> Select Web App >> User Permission >> Uncheck "Create Subsites"

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